I ordered boxes of 100 for each of the:
Drive screws (both 5mm and 6mm length, because of varying opinion on size)
Sled screws
Washers

Now I feel kind of wrong handing these out because Eutronix has just made them for sale on their site. I don't want to be a jerk and undercut them. ::shrugs::

Haha, I probably WILL need them all, though, because I tend to thread the crap out of the sled screws each time I take them out. Single-use-sled-screws, practically.